Examples of social media pages and online activities you may want to explore:

Content Marketing Institute: http://contentmarketinginstitute.com/blog/
Social Media Club Seattle: http://smcseattle.com/
Seattle Social Media Meetup: http://www.meetup.com/Seattle-Social-Media-Meetup/

Useful resources

If you find other useful sources, be sure to share them.

Facebook: http://www.pagemodo.com/blog/facebook-page-design-practices-cheat-sheet and http://blogs.constantcontact.com/product-blogs/social-media-marketing/better-facebook-content/
Twitter: http://socialmediatoday.com/mike-johansson/1324701/twitter-best-practices-brands-infographic
Pinterest: http://www.digitalinformationworld.com/2013/06/best-practices-for-pinterest.html
Instagram: http://blog.hootsuite.com/instagram-best-practices-brands/
LinkedIn: http://socialmediatoday.com/node/1611011
Tumblr: http://www.emoderation.com/tumblr-tutorial-for-brands-welcome-to-tumblr and http://socialmediatoday.com/emoderation/482391/tumblr-tutorial-brands-part-ii-hands-guide

The UW library has several books that are available online, such as:

Tackling Tumblr: Web Publishing Made Simple by Thord Daniel Hedengren (2011). eISBN 9781119950158.
Pinfluence: The complete guide to marketing your business with Pinterest by Beth Hayden (2012). eISBN 9781118414699.
LinkedIn Marketing: An Hour a Day by Viveka von Rosen (2012). eISBN 9781118461341

In addition, the library also has books from the “for Dummies” series for many of the social channels.